Is this the same as...
It could not happen by EVOLUTION in a multicellular organism.
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Yes, of course it is. That's exactly what I said, wasn't it? Evolution operates under readily deducible guidelines and limitations. Such a dramatic modification will not pop out of the ether absent any environmental pressure whatsoever toward that direction. I stated quite clearly that there is no evolutionary pressure in that direction (except arguably amongst humans). Did you not comprehend that? If you can think of one, by all means tell me what it is.
We have probably evolved the capacity to implement perpetual youth (via technology) but it didn't happen by accident.